Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 121,443	$ 140,018
Cash flows from investing activities:
Sale of investment securities	81,235	161,029
Maturities of investment securities	4,343	2,653
Purchase of investment securities	(90,106)	(162,845)
Proceeds from sale or liquidation of long-term investments	1,000	1,288
Purchase of long-term investments	(50)	(10,000)
Investments in real estate ventures	(23,358)	(43,280)
Distributions from investments in real estate ventures	23,041	11,205
Increase in cash surrender value of life insurance policies	(451)	(1,225)
Decrease (increase) in restricted assets	8,615	(6,872)
Issuance of notes receivable	0	(4,410)
Proceeds from sale of fixed assets	45	3
Capital expenditures	(19,157)	(7,859)
Repayments of notes receivable	4,410	4,000
Pay downs of investment securities	7,842	5,743
Proceeds from sale of preferred securities	0	1,000
Investments in real estate, net	(130)	(12,512)
Net cash used in investing activities	(2,721)	(62,082)
Cash flows from financing activities:
Proceeds from issuance of debt	243,620	1,519
Deferred financing costs	(6,600)	(624)
Repayments of debt	(4,698)	(4,968)
Borrowings under revolver	104,826	130,691
Repayments on revolver	(94,644)	(146,655)
Dividends and distributions on common stock	(147,270)	(139,430)
Contributions from non-controlling interest	248	0
Distributions to non-controlling interest	(9,508)	(564)
Proceeds from exercise of Vector options	398	1,321
Tax benefit of options exercised	412	756
Net cash provided by (used in) financing activities	86,784	(157,954)
Net increase (decrease) in cash and cash equivalents	205,506	(80,018)
Cash and cash equivalents, beginning of period	240,368	326,365
Cash and cash equivalents, end of period	$ 445,874	$ 246,347